Answer: p = m/Vp = 39.5 g/5.0 cm3p = 7.9 g/cm3 4.
a student practicing for a track meet ran 300 meters in 30 seconds. what was her average speed?
Answer:
10 m/sExplanation:
Her average speed can be found by using the formula
[tex]v = \frac{d}{t} \\ [/tex]
d is the distance
t is the time taken
From the question we have
[tex]v = \frac{300}{30} = 10 \\ [/tex]
We have the final answer as
10 m/sHope this helps you
what is this equivalent to
-k+3k
Answer:
2k
Explanation:
Answer:
+2k
Explanation:
Because +++k and -k answer is ++k
One +Cancel with -
Date:
Why do scientists study fossils?
A.
to understand how volcanoes are formed
B.
to understand life on Earth as it was millions
of years ago
C.
to understand when mountains were created
Answer:
b
Explanation:
Answer:
I think ur answer would be B
Explanation:
Hope this helps
(BRAINLIEST) PLEASE HELP!
Answer:
The answer would be Helium-8.
Scientists predict that the human population will continue to increase will likely happen as a result?
Answer: The prediction that human population is likely to increase may result in severe problems like global warming, extinction of animals due to human activities, et cetera.
Explanation:
The human population needs resources to survive, they use the resources in such a way that it is being exploited, the trees will be cut in such a large numbers that it will affect the animals depending them.
The human population also uses fossil fuels, burning of which releases harmful gases in the environment.
The usage of technology also comes with the curse of global warming because of release of green house gases such as chlorofluorocarbon.
With an increase in human population, there can be seen many harmful effects on environment.
Answer:
whatttttttttyu[poiuytrtyuiopoiuygtfdfghjkjhgfdfghjk
Explanation:
You have 28.5 g of iron shot that has a volume of 3.60 mL. From this information, calculate the density of iron.
Answer:
[tex]\boxed {\boxed {\sf \rho \approx 7.917 \ g/mL}}[/tex]
Explanation
Density can be found by dividing the mass by the volume.
[tex]\rho=\frac{m}{v}[/tex]
We know the iron sheet has a mass of 28.5 grams and the volume is 3.60 milliliters.
[tex]m= 28.5 \ g \\d= 3.60 \ mL[/tex]
Substitute the values into the formula.
[tex]\rho=\frac{28.5 \ g}{ 3.60 \ mL}[/tex]
Divide.
[tex]\rho = 7.91666667 \ g/mL[/tex]
Let's round to the nearest thousandth.
The 6 in the ten-thousandth tells us to round the 6 to a 7.
[tex]\rho \approx 7.917 \ g/mL[/tex]
The density of iron is about 7.917 grams per milliliter.
When
or more objects come in contact with eachother this is called
contact force.
two
Explanation:
When two or more objects come in contact with each other this is called contact force
1. (03.07 LC) Carbon atoms naturally bond with each other in chains, rings, or networks, but they cannot bond with oxygen or nitrogen. (2 points) True False
Answer:
false
Explanation:
Carbon atoms are found in hydrocarbons, naturally occurring compound with carbon and hydrogen, but there are molecules in nature that contain beside carbon and hydrogen, oxygen and nitrogen too. In this compounds there are carbon-oxygen and carbon-nitrogen covalent bonds.
Bellow you may see the chemical structure of adrenaline, a hormon found in the human body, were the oxygen (red) and nitrogen (blue) are bonded to carbon.
Answer:
false
Explanation:
Carbon atoms often naturally bond with each other in chains, rings, plates, or networks, and they also bond readily with hydrogen, oxygen, nitrogen, sulfur, phosphorus, and the halogens.
The columns in the periodic table are called groups. What do the elements in Group 17 have in common
Answer:
They all have 7 valence electrons on it's outer shell.
Answer:
I have that question rn, I think the best answer is that they tend to form ions with a -1 electric charge.
Explanation:
Which is the most likely to be reduced?
Answer : The correct option is, [tex]Zn^{2+}[/tex]
Explanation :
Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. That means, the loss of electrons takes place.Or we can say that, oxidation reaction occurs when a reactant losses electrons in the reaction.
Reduction reaction : It is defined as the reaction in which a substance gains electrons. That means, the gain of electrons takes place.Or we can say that, reduction reaction occurs when a reactant gains electrons in the reaction.
According to the electrochemical series, [tex]Zn^{2+}[/tex] most likely to be reduced because
Hence, the ion most likely to be reduced is [tex]Zn^{2+}[/tex].
The most likely to be reduced is Cu ²⁺. Because it is stronger oxidizing agent.
What is an oxidizing agent ?In a redox chemical reaction, an oxidizing agent is a material that "accepts" or "receives" an electron from a reducing agent. So every substance that oxidizes another material is an oxidant.
A material that induces oxidation by receiving electrons becomes reduced when it acts as an oxidizing agent. A chemical that reduces something by gaining electrons is said to be an oxidizing agent.
The reduction that takes place, which involves Cu, is the one with the highest positive reduction potential. This is because either Cu2+ is a stronger oxidizing agent than Zn2+ or Cu2+ is more likely to be reduced than Zn2+.
Thus, option D is correct.
To learn more about oxidizing agent, follow the link;
https://brainly.com/question/10547418
#SPJ2
All alkali metals belong to which group?
A. group 17
B. group 1
C. group 2
D. group 12
Answer:
Group 1
Explanation:
Alkali metals are the chemical elements found in Group 1 of the periodic table. The alkali metals include: lithium, sodium, potassium, rubidium, cesium, and francium.
Answer:
1
Explanation:
mainly so that you can mark the other one brainliest
Krista is conducting an investigation to determine how much water is best for her
sunflower plants. She uses five plants and gives each a different amount of water for six
weeks. Each week, she measures the height of each plant. She records her findings in the
chart below.
THE EFFECT OF WATER ON SUNFLOWER PLANTS
Week 1 Week 2 Week 3 Week 4 Week 5
Week 6
Amount of
water per
week
50 ml
100 ml
150 ml
200 ml
What information should be recorded below the weeks? (Hint: The dependent variable
should be recorded in the data chart.)
O the time it took each plant to reach a certain height
O the amount of water each plant received
o the amount of sun each plant received
O the height of each plant every week
Answer: Option D:The height of each plant every week
Explanation: In any experiment there are two variables one is independent variable and one is dependent variable.
One values of the experiment that can be changed is the independent variable that is amount of water given to the plants each week.
The values that cannot be changed and is dependent on independent variable is called dependent variable. This means that they change due to the change in the independent variable.
Here, the information that is to be recorded is the dependent variable. Height of each plant every week.
Which is the most likely to be reduced
Answer:
B
Explanation:
Answer: Fe3+
Explanation: j took the quiz
If an atom has 7 protons, 8 neutrons and 9 electrons, what is the mass number?
Answer:
Its mass number is 15
And this element is nitrogen N
Explanation:
Because mass number = number of proton + number of neutrons
So 7+ 8 = 15
An aqueous solution is 1.00% by mass ethanol, CH3CH2OH, and has a density of 0.996 g/mL.
The molarity of ethanol in the solution is
M.
The molarity of ethanol in the solution is 0.217 M
Further explanationGiven
1% by mass
density = 0.996 g/ml
Required
The molarity
Solution
mass/ml of Ethanol :
1% x 0.996 g/ml = 0.00996 g/ml
For 1 L solution :
0.00996 g/ml x 1000 ml/L = 9.96 g/L
Convert to mol/L(MW ethanol=46 g/mol) :
9.96 g/L : 46 g/mol= 0.217 mol/L = 0.217 M
Or you can use equation :
[tex]\tt M=\dfrac{\%mass\times \rho\times 10}{MW}\\\\M=\dfrac{1\times 0.996\times 10}{46}=0.217[/tex]
Which transfer of heat is depicted in the figure?
Answer:
Oh it is convention
Explanation:
because the heat transfer is through fluids
Students are discussing the pros and cons of petroleum as a naturals resource. Which of the following do you agree with?
Answer:
this is a multiple choice question where are the answers
Explanation:
Gaseous ethane, C2H6, burns in the presence of oxygen
gas according to the balanced equation below.
2 C2H6 (g) + 7 O2 (g) —+ 4CO2 (g) + 6 H20 (g)
How many moles of carbon dioxide can be produced from
1.00 mol of ethane?
04.00 mol CO2
0 0.50 mol CO2
01.00 mol CO2
2.00 mol CO2
Moles of Carbon dioxide(CO2) = 2
Further explanationGiven
Reaction
2 C2H6 (g) + 7 O2 (g) —+ 4CO2 (g) + 6 H20 (g)
Required
moles of carbon dioxide
Solution
The reaction coefficient shows the mole ratio of the compounds in the reaction equation (reactants and products)
From the equation, mol ratio of C2H6 : CO2 = 2 : 4, so mol CO2 :
mol CO2 = (4/2) x mol C2H6
mol CO2 = 2 x 1
mol CO2 = 2
Which of these particles are lost in the oxidation process?
OA protons
OB.
neutrons
Ос. .
electrons
OD.
atoms
Answer: electrons
Explanation:
During oxidation and reduction, both of which are redox reactions, electrons are transferred.
please help quickly!
for the first one ignore what i have pressed as i just guessed and it wont let me remove answers
Answer:
Iron II - pale green
Copper II - blue
Iron III - orange /brown
Nickel - green
Iron and Copper
how ferons is responsible for depletion of ozone layer?
how would I write these out
Answer:
Please see the attached image. The one on the left is the first one and the one on the right is the second one.
Hope that helps.
This is the smallest particle in a compound. It is made up of 2 or more atoms.
a) Find the gas speed of sulfur dioxide at 100.0 degrees Celsius? ______________
b) What is the rate of effusion of sulfur dioxide compared to nitrogen triodide at the same temperature? __________________
a. 381.27 m/s
b. the rate of effusion of sulfur dioxide = 2.5 faster than nitrogen triiodide
Further explanationGiven
T = 100 + 273 = 373 K
Required
a. the gas speedi
b. The rate of effusion comparison
Solution
a.
Average velocities of gases can be expressed as root-mean-square averages. (V rms)
[tex]\large {\boxed {\bold {v_ {rms} = \sqrt {\dfrac {3RT} {Mm}}}}[/tex]
R = gas constant, T = temperature, Mm = molar mass of the gas particles
From the question
R = 8,314 J / mol K
T = temperature
Mm = molar mass, kg / mol
Molar mass of Sulfur dioxide = 64 g/mol = 0.064 kg/mol
[tex]\tt v=\sqrt{\dfrac{3\times 8.314\times 373}{0.064} }\\\\v=381.27~m/s[/tex]
b. the effusion rates of two gases = the square root of the inverse of their molar masses:
[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]
M₁ = molar mass sulfur dioxide = 64
M₂ = molar mass nitrogen triodide = 395
[tex]\tt \dfrac{r_1}{r_2}=\sqrt{\dfrac{395}{64} }=\dfrac{20}{8}=2.5[/tex]
the rate of effusion of sulfur dioxide = 2.5 faster than nitrogen triodide
A student is a passenger in the front seat of a moving car. Which object is the BEST frame of reference for the student to determine how fast the car is moving relative to the ground?
A) A signpost on the side of the road
B) A truck traveling in the lane next to the car
C) The driver sitting next to the student
D) A person sitting in the backseat of the car
Answer:
the sing post
Explanation:
because the reference frame is a fixed object that determines whether a body is in motion or not so the other passengers are fixed but relative to the the the man is at rest but relative to the sign post it is in the motion, did I get me, sister
Identify each of the following as either an element or Compound. Write (E) for Element and (C)
for compound.
a. carbon
b. water
C. aluminum foil
d. plastic
e, tin
f. silicon dioxide
g. helium
h, arsenic
i. carbon dioxide
j. sodium chloride (table salt)
Carbon = C
Water = C
Aluminum foil = E
Plastic = E
Tin = E
Silicon dioxide = C
Helium = C
Arsenic = C
Carbon dioxide = C
Sodium Chloride = C
oles
A bottle of H3PO4 contains 30.00 g, how many moles are in this container?
Moles in the container : 0.306
Further explanationGiven
30 g of H3PO4
Required
moles in container
Solution
A mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12
1 mole = 6.02.10²³ particles
While the number of moles can also be obtained by dividing the mass (in grams) with the molar mass of element or molecule
MW of H3PO4 = 3.1 + 31 + 4.16 = 98 g/mol
mol = mass : MW
mol = 30 : 98
mol = 0.306
A flask containing 855 grams of water was heated. If the temperature of the water was raised from 21.0 to 85.0 degrees Celsius, how much heat (in joules) did the water absorb? the specific heat capacity of liquid water is 4.184J/g per C
Answer:
The heat absorbed by the water is 228,948.48 J
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
In this way, between heat and temperature there is a direct proportional relationship (Two magnitudes are directly proportional when there is a constant so that when one of the magnitudes increases, the other also decreases; and the same happens when either of the two decreases .). The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat and the mass of the body. So, the equation that allows to calculate heat exchanges is:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.
In this case:
c= 4.184 [tex]\frac{J}{g*C}[/tex]m=855 gΔT= Tfinal - Tinitial= 85 °C - 21°C= 64 °CReplacing:
Q= 4.184 [tex]\frac{J}{g*C}[/tex] *855 g* 64 C
Solving:
Q= 228,948.48 J
The heat absorbed by the water is 228,948.48 J
What is the percent yield of lithium hydroxide from a reaction of 7.40 g of lithium with 10.2 g of water? The actual yield was measured to be 12.1 g.
2Li(s) + 2H2O(l) = 2LiOH(aq) + H2(g)
Select one:
a. 72.5%
b. 53.1%
c. 89.3%
d. 47.4%
Answer: d. 47.4%
What is the percent yield of lithium hydroxide from a reaction of 7.40 g of lithium with 10.2 g of water? The actual yield was measured to be 12.1 g.
How can you explain therma expansion in terms of kinetic energy ? please help
Answer:
Heat causes the molecules to move faster (heat energy is converted to kinetic energy), which means that the volume of a solid or a liquid. ... The particles in the air do not have more kinetic energy than particles in the mercury, because they are the same.
Explanation:
I hope this help you!